This is a awesome idea!I think tigers would be a cool addition to the game.They don’t attack normally but if you got within 8 blocks of them they will growl warning you.If you go 6 blocks they will attack you.I bav not decided on how much damage they do but I think you,the coders and stuff could come up with that.If you kill them you get tiger meat (not so sure about this)and tiger tooth.You could use this to create spear which you can use as a weapon or you can use it to spear fish.

If Mojang plans to add gorillas, it has to be animal awareness cause Mojang is aware if endangered species like the polar bear. For the rest of the mobs however, they would make the jungle a much more rich environment...

I agree with snail about adding tigers (though I think how they interact with the player differently), and maybe they could also add the lion in savanna biomes and could breed them to make ligers, like with horses and donkeys to make mules.

Jaguars could be added into the jungle. They could be tameable (hard to tame). Jaguars would be cool as they would be like big ocelots. If Jaguars or any other cool big cats were added please give them hunting and sleeping behaviours. Making them tameable is not realistic but after all it's a game. It could be taken a step further and a new saddle could be added to let players ride them.